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| ID:
20096.0,
MPI für Kohlenforschung / Publikationen MPI für Kohlenforschung |
| Influence of cosurfactants on the properties of mesostructured materials |
| Authors: | Kleitz, F.; Blanchard, J.; Zibrowius, B.; Schüth, F.; Ågren, P.; Lindén, M. | | Language: | English | | Date of Publication (YYYY-MM-DD): | 2002-06-11 | | Title of Journal: | Langmuir | | Journal Abbrev.: | Langmuir | | Volume: | 18 | | Issue / Number: | 12 | | Start Page: | 4963 | | End Page: | 4971 | | Review Status: | Peer-review | | Audience: | Experts Only | | Abstract / Description: | The effects of the addition of two different types of cosurfactants, n-alkylamine and n-alkyl alcohol, on he phase behavior of silicate-surfactant mesophases and the pore size of the calcined materials have been investigated using X-ray diffraction, N-2-sorption, TG-MS, and solid state H-1 and C-13 NMR spectroscopy. The cosurfactants were added to a standard room-temperature synthesis, which results in a MCM-41 type, hexagonally ordered material in the absence of cosurfactant. Their addition led either to an increase or a decrease of the pore size and d spacing of the hexagonal mesophase, depending on the nature of the polar headgroup and on the chain length of the cosurfactant. For high cosurfactant/surfactant ratios, however, a transition to a lamellar phase was usually observed. The d spacing and the pore size of the hexagonal mesophase can be decreased considerably down to the supermicropore range by addition of butylamine without a marked decrease in the long- range order of the material. The addition of alcohol, on the other hand, resulted in an increase in the d spacing of the hexagonal phase by up to 3 Angstrom. These results are discussed in terms of differences in the ability of the cosurfactants to interact with the silicate as well as cosurfactant-induced changes in the packing parameter. | | Comment of the Author/Creator: | Date: 2002, JUN 11 | | External Publication Status: | published | | Document Type: | Article |
| Communicated by: | N. N. | | Affiliations: | MPI für Kohlenforschung
| | External Affiliations: | Abo Akad Univ, Dept Chem Phys, FIN-20500 Turku, Finland
| | Identifiers: | ISI:000176091900061 [ID No:1]
ISSN:0743-7463 [ID No:2] | |
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